Calipers.



L. KAPLAN.

CALI PERS. APPLICATlON FILED SEPT 14 19 7n Patented Feb. 25, 1919.

2 SHEETSQSHEETJ.

INVENTOR. Lwizdw I 2 WITNESSES L. KAPLAN.

CALIPERS.

APPucAnoN FILED SEPT-14. \917.

1,295,827, Patented Feb. 1919.

2 SHEET-SHEET I N VEN TOR.

WITNESSES. L 76? n LADI SLAV'KAPLAN, 0F CLINTON, CONNECTICUT.

CALIPEIRS.

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Specification of Letters Patent.

r rest-ea Feb. 25, rate.

Application filed September 14, 1917. Serial No. 191,402;

To all whom it may concern:

Be it known that I. LADISLAV KAPLAN, a citizen of the United States, residing at Clinton. in the county of Middlesex and State of Connecticut, have invented new and useful Calipers, of which the following is a specification.

This invention relates to certain new and useful improvements in calipers and deals particularly with that class in which there is employed a calibrated scale to magnify the movements of the jaws.

Another object of the present invention is to provide a means for facilitating the operations of the caliper jaws and also a means whereby the said jaws may be moved and set to any desired degree within the limits of the scale.

In the accompanying drawings similar letters of reference indicate like parts throughout the several views in which Figure 1 is a front elevation of the calipers constructed and arranged in accordance with the present invention; Fig. 2 is a cross section on line 22 Fig. 1; Fig. 3 is a detailed view of the gear member to which the indieating hand is attached; Fig. i is a view similar to Fig. 1 but showing the calipers slightly adjusted and set; Fig. 5 illustrates the adjustable stop member and its houslng;

Fig. 6 is a cross section on line 6-45 Fig. 5-

and Fig. 7 is a View .of the longitudinally adjustable screw stud.

In the present invention, most of the structural parts are identical with those of my prior Patent No. 1,194,182, August 8, 1916, but to enable those skilled in the art, to better understand the novel parts in this case I will describe those parts in detail, although I wish it understood that certain variations in the constructions may beresorted to without limiting or sacrificing any of the. scope or spirit of the invention.

The present calipers, according to my invention, are. provided with a handle 1, which may be of any suitable construction and material and rigidly secured into one end thereof is a metal shaft 2 which is provided with an off set portion 3, slightly above the handle. Extending from the upper portion of the ofi set 3 is an arm- -l, the upper extremity of which is bent to form a horn livotally secured to the metal shaft 2 is a substantially U shaped member (i'to one end of which is an arm 7 detachably secured.

The purpose of making this arm 7 detachable is so that arms of various shapes may be substituted to reach over and encompass the material being handled without interference therewith. The upper extremity of this arm 7 is also bent to form a horn 8. The opposite end of the member 6 is provided with a gear segment 9 which meshes. and operates a cog wheel 10. This gear wheel 10 is pivotally secured to an intermediate rigid extension 11 on the arm 4. This gear wheel is held under tension by a coil spring 12 and therefore acts as a means for drawing the caliper arms together.

I Secured preferably at its two extreme points, to the stationary caliper arm 1 is a. semicircular calibrated scale blade 13 over which the hand l-l'secured to the gear wheel 10. is adapted to play according to the movements of the caliper arms.

Rigidly secured to the U shaped member 6, to one side of its pivot, is a trigger 15 by which manual manipulation of the opening movement of the arms is accomplished.

It often happens, in using instruments, that it is desirable to set the same to certain measurements and it is to this end that I have invented a novel stop which can-be adjusted very easily to any extent to the limitsof the calibrated scale. The shaft 2 is provided with a slot 16 in which a milled nut 17 is adapted to fit so that the same may be apcrated from either side. Rigidl y secured to the shaft 2. adjacent the slot 16, is a housing 18 in which a screw stud 19 is adapted to slide. This stud is actuated by the manipu lation of the milled nut 17 through which it is threaded. The U shaped member 6 is provided with an extension 20 against which the inner end of the screw stud l9 coacts when adj u'sted.

In measuring the outside dimensions of an article, the two arms are separated by pres sure upon the trigger until the horns pass freely over the, article. The pressure is then released and the coil spring about the gear wheel will cause the arms to close to the extent of contact of the horns with the article. The indicating hand in the'meantime has moved over the scale and indicates thereon the distance between the horns. Now if it is desirable to maintain this measurement. all

that is necessary to do is to turn the milled projection on the U shaped member, this will nut until the screw stud contacts with the prevent further action of the coiled spring,

when the caliper is withdrawn from the article.

In this manner a desired measurement is kept stationary in the calipers.

stationary arm and located on the axis of said blade, a pointer pivotal-1y mounted on said extension, and means secured to and movable with the movable arm and adapted to-c0act with the pointer to move the same over the blade in correspondence with the movements of saidmovable arm.

' 2. Calipers comprising a stationary arm,

an arm. movable with respect to said stationary arm, a rigid extension on the stationary arm, said extension having a spring mechanism secured thereto, an extension on the movable arm adapted to coact with the spring mechanism for bringing said arms together, and an adjustable limiting stop on the stationary arm, and coacting with the movable arm to limit the movement of the same toward the stationary arm.

3. Calipers comprising a stationary arm,

a U-shaped arm pivoted to the stationary arm, said pivoted arm provided With a pro jection and a screw stud positioned on the stationary arm and adapted to coact with the projection on the pivoted arm to limit the movement of the same toward the stationary arm.

4:. Calipers comprising a stationary arm a U-shaped arm pivoted to the stationary arm, said pivoted arm provided With a projection, a screw stud on the stationary arm and adapted to coact with the projection on the pivoted arm to limit the movement of the same toward the stationary arm and means for adjusting said stud.

5. Calipers comprising astationary arm, an arm pivoted to the stationary arm, said pivoted arm provided with a projection, a housing on the stationary arm, a slot in the stationary arm, a nut in the slot, a screw in the nut, said screw slidably mounted Within the housing, said screw adapted to coact with said projection on the pivoted arm to limit the movement of the same toward the stationary arm and a stop pin on the stationary arm to limit the movement of the screw.

In testimony whereof I aflix my signature in the presence of two witnesses.

LADISLAV KAPLAN. 

